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As you increase the stroke on an engine, you also shorten the compression height of the piston, and in this case, the piston pin intersects the oil ring. Federal-Mogul supplies a steel spring groove spacer that takes the place of the lower oil ring support rail to add extra support to the oil control ring. The spacer should be installed on the bottom of the third piston groove with the gap 90 degrees from the pinhole. The gap is 0.010.